Replaced with a new-type air preheater；adjusted key operational parameters and optimized process flow

Hot air outlet temperature increased from 190°C to 630°C

Dry gas calorific value rose from 1200 kcal/Nm³ to 1400 kcal/Nm³

Dry gas production per unit increased from 25,000 Nm³/h to 27,000 Nm³/h

Carbon conversion rate improved by 2 percentage points and cold gas efficiency increased by 7 percentage points

Gasification air consumption reduced by 2,000 Nm³/h

Annual coal savings per gasifier: 5,800 tons, saving 3.5 million yuan